JPH05169262A - Nozzle positioning jig for arc spot welding - Google Patents

Abstract

PURPOSE:To prevent spatters from sticking to the nozzle inside, to maintain a shielding property, to surely prevent the occurrence of weld defects and to position a nozzle at the accurate position in performing arc spot welding by manual operation on two-superposed plates on the jig suitable for using for positioning the nozzle for spot welding at the suitable position. CONSTITUTION:A jig main body 7 arranged so as to cover from above the welding surface of a plate 1 at the specified interval is provided, a wire hole part 7a through which a wire 3 for arc spot welding is passed is formed at the position opposite to the arc spot welding position of the plate 1 on this jig main body 7 and a nozzle positioning stepped part 7b on which the tip face of the nozzle 6 for arc spot welding is abutted on to perform positioning is formed on the periphery of this wire hole part 7a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in positioning an arc spot welding nozzle at an appropriate position when manually performing arc spot welding on two materials to be welded such as plates. Regarding jigs.

[0002]

_2. Description of the Related Art Conventionally, wire feed type arc spot welding (MIG, CO ₂ , MAG, coated arc spot, etc.)
Thus, as shown in FIGS. 2 to 4, when joining the front side plate member 1 and the back side plate member 2 in a superposed state, at the welding position of the front side plate member 1, the front side plate member 1 is small in size by using an arc. By making a hole and pouring the weld metal 5 from the wire 3 into the hole, the plate materials 1 and 2 are joined together (see, for example, JP-A-55-139187).

In the figure, 4 is a nozzle used when manually performing arc spot welding. The nozzle 4 is arranged so that its tip end surface abuts on the surface of the front plate 1 during welding (skirt). In addition to the type nozzle), a notch 4a for discharging the shield gas is formed in the contact portion of the nozzle 4 with the front side plate member 1. Further, 4A is a nozzle used when performing arc spot welding by a welding robot, and the nozzle 4A is arranged such that its tip surface is slightly above the tip of the wire 3 during welding. Further, reference numerals A and B in the figure
The arrow marked with indicates the flow of the shield gas.

By the way, in the current arc spot welding, when manually performing the arc spot welding, unlike a normal GMAW (Gas Metal Arc Welding) nozzle, as shown in FIGS. 2 (a) and 2 (b). , Front plate (weld part)
The tip of the nozzle 4 is brought into contact with the nozzle 1 to generate an arc for a predetermined time, thereby performing arc spot welding. The role of the nozzle 4 in this case is to improve the shielding property of the shield gas and to keep the distance between the surface of the plate 1 and the wire 3 constant. In the case of manual operation, the latter, that is, the constant distance is constant. The function of retention is important. Here, GMAW means welding while sending a shielding gas from around the molten wire 3, and carbon dioxide welding, MAG (Ar 80% + CO ₂ 20%) welding, MIG (A) depending on the type of gas.
r100%) Welding.

On the other hand, when performing arc spot welding by a welding robot, it is not necessary to position the tip of the nozzle 4 by intentionally abutting it on the surface of the front plate 1 as shown in FIGS. 2 (a) and 2 (b). Further, since the improvement of the shield property may be covered by the increase of the shield gas flow rate, the nozzle 4A to be used may be a normal nozzle as shown in FIGS. 3 (a) and 3 (b).

[0006]

However, as shown in FIG.
In the conventional manual arc spot welding means shown in (a) and (b), since the tip of the nozzle 4 is in contact with the surface of the front side plate member 1, spatter during arc generation is generated in the nozzle 4.
If the spatter is not removed frequently, the flow of the shielding gas is disturbed, the shielding property is deteriorated, and welding defects may occur.

Further, as shown in FIG. 4, even in arc spot welding, in particular, a hole portion 1a is formed by previously forming a hole in the welding position of the front plate 1, and the weld metal by arc spot welding is formed in the hole portion 1a. It has been attempted to prevent the welded part from largely rising from the front side plate material 1 by pouring, and to ensure sufficient penetration even if the front side plate material 1 is thick. Position of the nozzle 4 and the hole 1a
If the position is greatly deviated, the required strength cannot be obtained. At this time, it is considerably troublesome and requires skill to perform the positioning of the nozzle 4 accurately by visual observation.

The present invention is intended to solve such a problem, and prevents spatter from adhering to the inner surface of the nozzle to maintain the shielding property to reliably prevent the occurrence of welding defects and to accurately measure the nozzle. An object of the present invention is to provide a positioning jig for a nozzle for arc spot welding that can be installed at various positions.

[0009]

In order to achieve the above object, a positioning jig for an arc spot welding nozzle of the present invention has an arc spot welding nozzle at a predetermined position when performing arc spot welding on a material to be welded. An arc spot welding of the material to be welded in the jig body, the jig body being arranged to cover the welding surface of the material to be welded from above at a predetermined interval. Nozzle for forming a wire hole through which the arc spot welding wire penetrates at a position opposite to the position, and positioning the tip end surface of the arc spot welding nozzle in contact with the outer periphery of the wire hole. It is characterized in that a positioning step is formed.

Further, the jig body may be provided with a welded material positioning step portion for engaging the welded material and positioning the jig body with respect to the welded material.

[0011]

In the above-described arc spot welding nozzle positioning jig of the present invention, the tip end surface of the nozzle is brought into contact with the nozzle positioning step portion of the jig body which is arranged at a predetermined distance from the welding surface of the material to be welded. By contacting each other, the nozzle can be positioned while maintaining a necessary distance from the welding surface. At this time, the wire penetrates the wire hole, the shield gas reaches the weld along the outer periphery of the wire through the wire hole, and passes through the gap between the jig body and the welding surface. Is discharged.

Further, since the jig body is also positioned with respect to the material to be welded by engaging the material to be welded with the step portion for positioning the material to be welded formed on the body of the jig, the nozzle of the material to be welded is positioned. Positioning can be performed accurately with respect to the arc spot welding position.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A positioning jig for an arc spot welding nozzle as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is its plan view and FIG. 1 (b) is FIG. 1 (a).
Ib arrow view, and FIG. 1C is a longitudinal cross-sectional view of a main part showing the nozzle positioning state.

As shown in FIGS. 1 (b) and 1 (c), also in the present embodiment, when two superposed front side plate materials 1 and back side plate materials 2 to be welded are wire-spot type arc spot welding. Will be described. In addition, in the present embodiment, prior to welding, the arc spot welding position of the front side plate member 1 is preliminarily formed with a hole 1a having a predetermined diameter by drilling. As described above with reference to FIG. 4, arc spot welding is performed in the state where the hole portion 1a is formed in the front plate material 1 at the welding position as described above, whereby the weld metal from the wire 3 is poured into the hole portion 1a. It is possible to prevent a large rise from the surface (welding surface) of No. 1 and to obtain sufficient penetration.

In the present embodiment, a positioning jig as shown in FIGS. 1 (a) to 1 (c) is provided to position the nozzle 6 at a predetermined position when the plate materials 1 and 2 are arc-spot welded. Used. This positioning jig is composed of a jig body 7 having a U-shaped cross section, which is arranged so as to cover the surface (welding surface) of the front plate material 1 from above with a predetermined interval. The wire hole portion 7 through which the wire 3 penetrates is provided at a position facing the arc spot welding position 2 of FIG.
Six a are formed.

Then, on the outer periphery of each wire hole 7a,
A nozzle positioning step portion 7b is formed for fitting and abutting the tip end portion of the nozzle 6 for positioning. Here, in this embodiment, the distance from the surface of the front plate 1 to the tip surface of the nozzle 6 is set to be about 20 mm with the tip surface of the nozzle 6 abutting the step portion 7b. ..

Further, in this embodiment, as shown in FIG. 1 (b), inside the lower ends of the leg portions 7d, 7d on both sides of the jig body 7, there are plate members engaging with both upper edge portions of the front plate member 1. Positioning step portions 7c, 7c are formed respectively, and each step portion 7c
The jig main body 7 is positioned with respect to the plate materials 1 and 2 by engaging the upper edge portion of the front side plate material 1 with.

The material of the jig body 7 may be a conductive material or an insulating material, but a material that does not deform within 100 ° C. is used.

With the above-mentioned structure, in this embodiment, first,
The plate material positioning step portions 7c, 7c of the jig body 7 are engaged with the upper edges of both sides of the front plate material 1, respectively, so that the nozzle hole portions 7a and the arc spot welding positions of the plate materials 1, 2 are aligned with each other. The jig body 7 is positioned with respect to the plate materials 1 and 2.

In this way, the jig body 7 is attached to the plate materials 1 and 2.
By positioning, the jig body 7 is arranged at a predetermined distance from the surface of the front plate member 1. Then, the nozzle positioning step portion 7 of the jig body 7 arranged at a predetermined position
By fitting and abutting the tip portion of the nozzle 6 on b, the nozzle 6 is positioned while maintaining a required distance from the welding surface.

After this, arc spot welding is performed by passing the wire 3 through the wire hole 7a and generating an arc. At this time, the shielding gas is the wire 3
Along the outer circumference of the wire, reaches the weld through the wire hole 7a, and is discharged through the gap between the jig body 7 and the surface of the front plate 1.

As described above, according to the positioning jig of this embodiment, since the spatter can be prevented from adhering to the inner surface of the nozzle 6 and the flow of the shield gas is not disturbed, the shielding property is maintained and the welding defect is prevented. The occurrence can be reliably prevented.
Further, the nozzle 6 can be installed extremely easily and accurately at a predetermined arc spot welding position.

The present invention is not limited to the above-mentioned embodiments, and is included in the scope of the present invention even if there are design changes and the like without departing from the gist of the present invention. For example, in the above-mentioned embodiment, the case where the workpieces are the plate materials 1 and 2 in which two sheets are welded and the hole-side arc spot welding in which the hole portions 1a are formed at the six arc spot welding positions of the front plate material 1 Although described, the present invention is not limited to such a material to be welded, but may be applied to the material to be welded to be subjected to arc spot welding in the same manner as in the above-mentioned embodiment.

[0024]

As described above in detail, according to the positioning jig for the arc spot welding nozzle of the present invention, the nozzle body for positioning the jig is arranged at a predetermined distance from the welding surface of the material to be welded. The tip of the nozzle is brought into contact with the step so that the nozzle can be positioned while maintaining the required distance from the welding surface, so spatter is prevented from adhering to the inner surface of the nozzle, and shielding is secured. In addition to reliably preventing the occurrence of welding defects, there is an effect that the nozzle can be extremely easily and accurately installed at a predetermined arc spot welding position.

Further, since the jig body is accurately positioned with respect to the material to be welded by engaging the material to be welded with the step portion for positioning the material to be welded of the jig body, the nozzle is arced to the material to be welded. There is also an effect that positioning can be performed more accurately with respect to the spot welding position.

[Brief description of drawings]

1A and 1B show a positioning jig for a nozzle for arc spot welding as an embodiment of the present invention, in which FIG. 1A is a plan view thereof, FIG. FIG. 3 is a longitudinal sectional view of a main part showing a nozzle positioning state thereof.

FIG. 2 is a view showing a conventional arc spot welding means that is manually performed, in which (a) is a side view showing the welded portion;
(b) is a longitudinal sectional view showing the welded portion.

3A and 3B show arc spot welding means performed by a welding robot, wherein FIG. 3A is a side view showing the welded portion, and FIG. 3B is a vertical sectional view showing the welded portion.

FIG. 4 is a side view showing an arc spot welding means with holes.

[Explanation of symbols]

 1 Front Side Plate Material (Welding Material) 1a Hole 2 Back Side Plate Material (Welding Material) 3 Wire 6 Nozzle 7 Jig Body 7a Wire Hole 7b Nozzle Positioning Step 7c Plate Material Positioning Step 7d Leg

Claims (2)

[Claims] 1. A jig for positioning an arc spot welding nozzle at a predetermined position during arc spot welding of a material to be welded, the welding surface of the material being welded from above at a predetermined interval. A jig main body is provided so as to cover the jig main body, and a wire hole portion for penetrating the arc spot welding wire is formed at a position facing the arc spot welding position of the workpiece in the jig main body, A positioning jig for an arc spot welding nozzle, wherein a nozzle positioning step portion for contacting and positioning the tip end surface of the arc spot welding nozzle is formed on the outer periphery of the wire hole portion. 2. A jig-positioning step for engaging the material-to-be-welded and positioning the jig body with respect to the material-to-be-welded is formed in the jig body. The positioning jig for a nozzle for arc spot welding according to claim 1.